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CVE-2026-42274

Vulnerability in github.com/dadrus/heimdall (CVE-2026-42274)

Summary

vulnerability in github.com/dadrus/heimdall (CVE-2026-42274). Risk of unauthorized operations or information disclosure. Exploitable via ``allow_encoded_slashes``. Mitigation: upgrade to `0.17.14` or later.

AI summary snake-internal / snake-material-v2

A vulnerability tracked as **CVE-2026-42274** has been found in github.com/dadrus/heimdall. Attackers can target a specific entry point like ``allow_encoded_slashes`` over the network to misuse the product. Risk of unauthorized operations or information disclosure. CVSS score: ?/10. What to do: upgrade github.com/dadrus/heimdall to **0.17.14** or later. If unsure, ask your IT team or search "github.com/dadrus/heimdall CVE-2026-42274" on the vendor's site.
CVE-2026-42274 (github.com/dadrus/heimdall) — CWE-35 / Attack surface: `allow_encoded_slashes` / `no_decode` / `normalize_path` Patched: `0.17.14` — apply immediately Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs. Refs: see the GHSA / vendor advisory / patched release linked on this page.
❓ What is the problem
**A vulnerability** (CWE-35) exists in github.com/dadrus/heimdall. Attackers reach the vulnerable code path via ``allow_encoded_slashes`` without authentication.
📍 Affected scope
github.com/dadrus/heimdall — . Attack surface: `allow_encoded_slashes` / `no_decode` / `normalize_path`.
🔥 Severity
Severity: ?. Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **0.17.14**.
🛡️ Workaround
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
🔍 Detection
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run `grep -r 'github.com/dadrus/heimdall' .` against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response Actions (7 steps)

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    grep -r 'github.com/dadrus/heimdall' . | grep -v node_modules

    リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で `github.com/dadrus/heimdall` を grep し、稼働しているサービス・バージョンを把握する。

  2. 6
    Apply patch patch 
    Upgrade github.com/dadrus/heimdall to 0.17.14

    ステージング環境で 0.17.14 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスと、Step 3 で見つけた異常検知の続報チェックを含めること。

  3. 7
    Post-deployment verification verify 
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番では Step 3 と同じログクエリでアラート再発が無いか継続監視。

Affected packages

go github.com/dadrus/heimdall
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.17.14"}]}]

References

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